Jan 28, 2013 6:00pm EST
a science lesson inspired by an announcement from nasa. hari sreenivasan has the details. >> sreenivasan: just what is dark matter? find a short video with a simple answer on today's science roundup. nasa and the european space agency are partnering to send a telescope into space to investigate dark matter and dark energy. read more about these mysterious forces and what scientists hope to find on our science page. and think you've received bad advice about social security? our benefits guru gets to the bottom of that issue in today's "ask larry" column on our business page. all that and more is on our web site, newshour.pbs.org. gwen? >> ifill: and that's the newshour for tonight. on tuesday, we'll return to the immigration debate with a look at the president's plans for reform. i'm gwen ifill. >> woodruff: and i'm judy woodruff. we'll see you online, and again here tomorrow evening. thank you, and good night. >> major funding for the pbs newshour has been provided by: >> bnsf railway. >> macarthur foundation. >> and with the ongoing support of these institutions and foundations. and...
Jan 31, 2013 6:00am PST
it is going to be, and if it hits us what kind of damage is it likely to do? >> well that's what nasa scientists are really going to be watching on this pass. next month on the 15th, this asteroid is going to swing just 17,000 miles away from earth at much lower than the navigation satellites and, that we use every day for tour phones and our gps. now it is not going to hit this time around, but such a close encounter of a rock this big, something like, 40 meters, meters wide, 50 meters wide, they haven't had this kind of a close encounter of a rock this size before. nasa will be watching it. scientists and astronomers will be tracking after it swings by to see how this close fly-by will change the orbit when it does come around again. martha: in your terms, these things happen, you know, every thousands of years, several thousands years. when was the last time something like this did actually make contact and what was the impact? >> well to give you some asteroid is about the same size as the rock that exploded over siberia in 1908. that event that leveled00 of square miles of land,
Jan 30, 2013 9:00pm PST
. and lift-off of the atlas 5 rocket. >> nasa launched a new communications satellite from cape canaveral ral to help relay data and messages with the international space station and the hubble telescope. >>> back here on earth, facebook turned in a healthy earnings report better than wall street expected in many resents but investors turned up their noses at facebook stock, down 3.5% in after hours trading. david louie explains why. >> reporter: facebook has been scrambling to catch up as its more than 1 billion users shift to mobile device but the screens are so much smaller. on desktop there was plenty of room for ads. the facebook c.e.o. is declaring success. >> today there is no argument, facebook is a global company. >> reporter: most mobile ads now contributing 23% of ad revenue, up 9% in just three months and the social network is pushing hard to make mobile use fast and appealing. according to tech analysts and blogger robert scobel. we talked to him via skype. >> the new app is faster again and has more of the desktop features. you can tell they are working at taking over the mobile